| 摘要 |
THIS INVENTION PROVIDES A COPPER FOIL (1) FOR A PRINTED WIRING BOARD, WHICH COMPRISES A COPPER FOIL (1), AN ALLOY LAYER (2) (A) COMPRISING COPPER, ZINC, TIN AND NICKEL WHICH IS FORMED ON A SURFACE OF THE COPPER FOIL (1), SAID SURFACE TO BE BROUGHT INTO CONTACT WITH A SUBSTRATE FOR A PRINTED WIRING BOARD, AND A CHROMATE LAYER (3) WHICH IS FORMED ON A SURFACE OF THE ALLOY LAYER (2) (A). THE COPPER FOIL (1) FOR A PRINTED WIRING BOARD HAS THE FOLLOWING FEATURES: EVEN IF A PRINTED WIRING BOARD IS PRODUCED USING A LONG-TERM STORED COPPER FOIL (1), THE INTERFACE BETWEEN THE COPPER FOIL (1) AND THE SUBSTRATE IS ONLY SLIGHTLY CORRODED WITH CHEMICALS; EVEN IF THE COPPER FOIL (1) CONTACTS A VARNISH CONTAINING AN ORGANIC ACID, E.G., A VARNISH FOR AN ACRYLIC RESIN, IN THE FORMATION OF A COPPER-CLAD LAMINATE, THE BOND STRENGTH IS SUFFICIENT. EVEN IF A PRINTED CIRCUIT BOARD MADE BY USING THE COPPER FOIL (1) IS PLACED IN A HIGH TEMPERATURE ENVIRONMENT, E.G., IN AN ENGINE ROOM OF AN AUTOMOBILE, FOR A LONG PERIOD OF TIME, BLISTERING OF THE COPPER CIRCUIT FROM THE SUBSTRATE DUE TO DETERIORATION OF THE INTERFACE BETWEEN THE COPPER CIRCUIT AND THE SUBSTRATE DOES NOT TAKE PLACE. |
